optional.hpp

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#pragma once

#include <zk/config.hpp>

#include <optional>

namespace zk
{


template <typename T>
using optional = std::optional<T>;

using nullopt_t = std::nullopt_t;

using std::nullopt;

template <typename FUnary, typename... T>
auto map(FUnary&& transform, const optional<T>&... x) -> optional<decltype(transform(x.value()...))>
{
    if ((x && ...))
        return transform(x.value()...);
    else
        return nullopt;
}

template <typename T>
optional<T> some(T x)
{
    return optional<T>(std::move(x));
}


}